Arduino with PIR motion Sensor, LED and buzzer (Code)

Arduino with PIR motion Sensor, LED and buzzer

Today we shall learn to use a PIR motion sensor with arduino. The required kits are :

1. An arduino and its adapter
2. Few jumper Wires
3. PIR motion sensor
4. A LED with 220 OHM resistor
5. A breadboard
6. A buzzer

There are 3 pins on the PIR sensor. They are :

1. Output-motion input pin
2. GND-Ground pin
3. VCC-positive power pin

There are two legs on a LED. The longer leg is positive and the shorter leg is negative. A buzzer has similar legs. The steps to setup hardware are listed below:

• Connect 5V pin on the arduino to +VE on the breadboard .
• Connect GND pin on the arduino to -VE on the breadboard .
• Connect "VCC" pin of the sensor to +ve on the breadboard.
• Connect Output pin to any analog or digital pins on the arduino.In this tutorial I connected it with A0
• Connect "GND" ground pin on the sensor to -VE on the breadboard.
• Fix the LED on the breadboard.
• Connect longer LED leg to pin 13 on the arduino .
• Connect shorter LED leg to GND pin on the breadboard through a 220 ohm resistor.
• Fix buzzer on the breadboard.
• Connect longer buzzer leg to pin 12(or any other pin) on the arduino.
• Connect shorter buzzer leg to GND pin on the arduino.

The setup is complete. Now, upload the code and enjoy.

Check out the tutorial

(Code)

const int motionpin=A0;
const int ledpin=13;
const int buzzpin=12; // ledpin,motionpin and buzpin are not changed throughout the process
int motionsensvalue=0;
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
pinMode(ledpin, OUTPUT);
pinMode(motionpin,INPUT);
pinMode(buzzpin,OUTPUT);
}
void loop() {
// put your main code here, to run repeatedly:
motionsensvalue=analogRead(motionpin); // reads analog data from motion sensor
if (motionsensvalue>=200){
digitalWrite(ledpin,HIGH);
tone(buzzpin,100); //turns on led and buzzer
}
else {
digitalWrite(ledpin,LOW); //turns led off led and buzzer
noTone(buzzpin);
}
}